Ornamental glass



. July 4, 1933.

F. CLARKE -ORNAMENTAL GLASS Filed May 19, 1952 Patented July 4,- 1933FRANK CLARKE, or s'r. LOUIS, lmussolini,

ASSIGNOR T PITTSBURGH PLATE GLASS COMPANY, A CORPORATION OF PENNSYLVANIAOBNAMENTAL GLASS Application led May 19,

The invention relates'to ornamental glass designed particularly for use'in signs, but j not limited to such use. It has for its objects theprovision of a glass' construction easily and cheaply produced andpresenting an unusual and pleasing appearance, when viewed from thefront. The invention is illustrated as applied to a single letter, butitwill be understood that combinations of letters and il numbers may beused as well as a wide va riety of ornamental designs. One embodimentof'the invention is illustrated in the accompanying drawing, wherein:

Figure 1 is asection on theline I-I of Fig. 2.-'-\ Fig. 2 is a frontelevation of the construction. Fig. 3 is a front elevation of the glassplate which has been provided withl itsornamentation in relief. Fig. 4is a section on the line IV--IV of Fig. 3. Fig. 5 is a similar section,but with its rear face provided with color lms. And Fig. 6 is a sectionthrough the mirror of the face plate. Referring to the drawing, l isI aframe of any suitable type which carries the glass plates 2 and 3 andthe backing 4 of any suitable material fo holding the glass plates inposition. The plate 2 is shown as provided with a very simple design,namely the'letter E, but it will be understood that the principle isapplicable tomore complicated designs. The design is `preferably formedon the rear face of the plate 2 by sand blasting.. This is accomplishedby coating the border portion 5 and the letter portion 6 with a materialresistant to the action of a sand blast, preferably a rubbercomposition. After the plate is thus coated, a sand blast is applied inthe usual way, which sand blast removes the portion 7 of theplatesurrounding the letter,

thus leaving the portions 5 and 6 in relief,

as -indicated in Fig. 5. The rubber coating is then removed anda-further light application of the sand blast is made to roughen therear surfacev of the ortions 5 and 6, Yso that they will take an holdthe paint or colorin more effectively than would the polished g assSurface. f

The plate is now ready for coloring, which the backgroundcoating v9 maybe yellow. The

much more uniform than plate employed back through.

may be done in various ways by hand or 1932. Serial No; 612,287.

back plate 3 is provided on its rear face with a coating 11 of silver orother suitable reflect-I ing material, such as cadmium, lead sulphide vor quick silver.- The parts are then assembled,

as indicated in Fig. l with the mirror plate 3 behind the face plate 2.This arrangement gives a design of unusualand pleasing appearance. Theforming of the design in relief on the-back of the plate 2 makes itstand out more clearly-than is the case where a design is merely paintedon the back of a. glass sheet. The use of the mirror behind the faceplate Vbrightens the appearance of the design and renders it moreattractive. The roughening of the rear surface of the face plate, due tothe sand blasting, also improves the appearance as the reflection issoftened and the application'of the loring material is heresuch coloringis applied to a polished glass surface. The colors employed are notopaque, but are relatively translucent so that a `certain amount ofmirror reflection is noticeable through such colors. As agresult thedesi n stands out clearly even in a relatively ysu dued light.

The term relief refers to the formation of the design either above thelevel of the background or below it, the general' effect being thev samein both cases.

' What I claim is:

In combination, a glass plate having its rear Vface provided with a desin in relief, said design and the area of t e rear face surrounding itbeing roughened, and a second sheet of Aglass having its front face inengagement with the rear face of the first sheet and provided upon itsother face with a metallic reflecting coating, said design and thesurrounding area being covered by colored coatings applied thereto whichare of contrastinfg y the re acting coating to re'liect vlight there- Intestimony whereof, I have hereunto subscribed my name this 13th day ofMay, 1932.

. FRANK CLARKE;

color and are translucent to permit

